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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 77,520	$ 45,092	$ 211,589	$ 106,945
Other comprehensive (loss) income:
Foreign currency translation	(5,358)	(1,388)	(21,208)	9,342
Change in unrealized losses (gains) on marketable securities, net of tax	(134)	(13)	(234)	(17)
Total other comprehensive (loss) income	(5,492)	(1,401)	(21,442)	9,325
Comprehensive income	$ 72,028	$ 43,691	$ 190,147	$ 116,270

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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